I have followed these steps.
I get an error message “Adobe Flash installation failed, popping controller in 5 seconds”
I noticed when I tried it a second time the CoreAudioKit.framework folder was removed from the /Documents folder on the AppleTV. I FTP’d it again and tried to install… same prob.
I noticed the log file:
2009-09-26 07:54:18.709 mHelper Root filesystem already writable
2009-09-26 07:54:18.710 mHelper mounting image: /Users/frontrow/Install Flash Player 10 UB.dmg
2009-09-26 07:54:20.898 mHelper mounted: /Volumes/Install Flash Player 10 UB 1
2009-09-26 07:54:20.924 mHelper removing file at /System/Library/Frameworks/CoreAudioKit.framework then install
2009-09-26 07:54:20.936 mHelper copying: /Users/frontrow/Documents/CoreAudioKit.framework to: /System/Library/Frameworks/CoreAudioKit.framework
BTW, I made the permissions on the CoreAudioKit.framework folder read-write by everybody in case it was a security issue.